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Combination(nCr). Permutation & Combination Calculator is an online statistics tool programmed to calculate the nPr-Permutation and nCr-Combination of the n different items or symbols. The factorial is involved to perform both the ncr and npr calculations for a given N and R sample points of a data set.
People have done a lot of studies on Pascal's Triangle, but in practical terms, it's probably best to just use your calculator to find nCr, rather than using the Triangle. The Triangle is cute, I suppose, but it's not terribly helpful in this context, being more time-consuming than anything else.